c# - 从 FTP 上传文件和下载文件

Question

我正在尝试制作一个将 .exe 文件上传/下载到 FTP

的程序

我尝试使用 FtpWebRequest，但我只能成功上传和下载 .txt 文件。

然后我在这里找到了使用 WebClient 下载的解决方案:

WebClient request = new WebClient();
request.Credentials = new NetworkCredential("username", "password");
byte[] fileData =  request.DownloadData("ftp://myFTP.net/");

FileStream file = File.Create(destinatie);
file.Write(fileData, 0, fileData.Length);

file.Close();

这个解决方案有效。但是我看到 WebClient 有一个方法 DownloadFile 没有用。我认为是因为它仅在 HTTP 上不适用于 FTP。我的假设是真的吗？如果不是，我怎样才能让它工作？

是否有任何其他解决方案可以使用 FtpWebRequest 将 .exe 文件上传/下载到 ftp？

Answer 1

两者都是WebClient.UploadFile和 WebClient.DownloadFile FTP 和二进制文件都能正常工作。

---

上传

WebClient client = new WebClient();
client.Credentials = new NetworkCredential("username", "password");
client.UploadFile(
    "ftp://ftp.example.com/remote/path/file.zip", @"C:\local\path\file.zip");

如果您需要更好的控制，WebClient 不提供(如 TLS/SSL encryption、ascii/文本传输模式、传输恢复等)，请使用 FtpWebRequest .简单的方法是使用 Stream.CopyTo 将 FileStream 复制到 FTP 流:

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.UploadFile;  

using (Stream fileStream = File.OpenRead(@"C:\local\path\file.zip"))
using (Stream ftpStream = request.GetRequestStream())
{
    fileStream.CopyTo(ftpStream);
}

如果你需要监控上传进度，你必须自己分块复制内容:

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.UploadFile;  

using (Stream fileStream = File.OpenRead(@"C:\local\path\file.zip"))
using (Stream ftpStream = request.GetRequestStream())
{
    byte[] buffer = new byte[10240];
    int read;
    while ((read = fileStream.Read(buffer, 0, buffer.Length)) > 0)
    {
        ftpStream.Write(buffer, 0, read);
        Console.WriteLine("Uploaded {0} bytes", fileStream.Position);
    } 
}

对于 GUI 进度(WinForms ProgressBar)，请参阅:
How can we show progress bar for upload with FtpWebRequest

如果要上传文件夹中的所有文件，请参阅
Recursive upload to FTP server in C# .

---

下载

WebClient client = new WebClient();
client.Credentials = new NetworkCredential("username", "password");
client.DownloadFile(
    "ftp://ftp.example.com/remote/path/file.zip", @"C:\local\path\file.zip");

如果您需要更好的控制，WebClient 不提供(如 TLS/SSL encryption 、ascii/文本传输模式、resuming transfers 等)，请使用 FtpWebRequest .简单的方法是使用 Stream.CopyTo 将 FTP 响应流复制到 FileStream :

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.DownloadFile;

using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(@"C:\local\path\file.zip"))
{
    ftpStream.CopyTo(fileStream);
}

如果你需要监控下载进度，你必须自己分块复制内容:

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.DownloadFile;

using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(@"C:\local\path\file.zip"))
{
    byte[] buffer = new byte[10240];
    int read;
    while ((read = ftpStream.Read(buffer, 0, buffer.Length)) > 0)
    {
        fileStream.Write(buffer, 0, read);
        Console.WriteLine("Downloaded {0} bytes", fileStream.Position);
    }
}

对于 GUI 进度(WinForms ProgressBar)，请参阅:
FtpWebRequest FTP download with ProgressBar

如果要从远程文件夹下载所有文件，请参阅
C# Download all files and subdirectories through FTP .